The Water Supply (Water Quality) Regulations 2018

Made: 22 May 2018

Laid before the National Assembly for Wales: 25 May 2018

Laid before Parliament: 30 May 2018

Coming into force: 15 June 2018

The Welsh Ministers are designated for the purposes of section 2(2) of the European Communities Act 1972 in relation to the quality of water intended for domestic purposes or for use in a food production undertaking.

The Welsh Ministers make these Regulations in exercise of the powers conferred upon them by section 2(2) of the European Communities Act 1972 and sections 67, 69, 77(3) and (4) and 213(2) of the Water Industry Act 1991 .

PART 1 — General

Title, commencement and application

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• (1) The title of these Regulations is the Water Supply (Water Quality) Regulations 2018 and they come into force on 15 June 2018.

• (2) Parts 1 to 9 and 11 of these Regulations apply in relation to the supply of water by every—

• (a) water undertaker whose area is wholly or mainly in Wales; and

• (b) water supply licensee so far as relating to licensed activities using the supply system of any water undertaker whose area is wholly or mainly in Wales.

• (3) Part 10 of these Regulations applies to local authorities in Wales, as regards the discharge of functions under that Part, in relation to every—

• (a) water undertaker whose area is wholly in Wales;

• (b) water undertaker whose area is partly in Wales and partly in England, but only in respect of the part in Wales; and

• (c) water supply licensee so far as relating to licensed activities using the supply system situated in Wales of any water undertaker.

Interpretation

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• (1) In these Regulations—

• “the 2010 Regulations” means the Water Supply (Water Quality) Regulations 2010 ;

• “the Act” means the Water Industry Act 1991;

• “appropriate local authority”, in relation to—a departure authorised under regulation 22,an application for any such authorisation, oran event specified in regulation 35(6),means a local authority whose area contains any part of the water supply zone to which the authorisation relates or, in the case of an application, would relate if a departure were authorised in the terms sought, or whose area is affected or is likely to be affected by the event;

• “blending point” means a point at which water originating from two or more sources and treated for the purposes of their supply for regulation 4(1) purposes are combined under conditions that are designed to secure that, after such combination, the requirements of regulation 4(2) are met;

• “Chapter III” means Chapter III (quality and sufficiency of supplies) of Part III (water supply) of the Act;

• “consumer” means a person to whom water is supplied for regulation 4(1) purposes by a relevant supplier in the discharge of its duties under Chapter III;

• “disinfection” means a process of water treatment to remove or render harmless to human health, every pathogenic micro-organism and pathogenic parasite that would otherwise be present in the water; and “disinfected” shall be construed accordingly;

• “E.coli”meansEscherichia coli;

• “groundwater” means water contained in underground strata, and section 221(3) of the Water Resources Act 1991 (general interpretation) will have effect for the purpose of this definition as it has effect for the purpose of construing references in that Act to water contained in underground strata;

• “Group A parameter” means a parameter specified in column 2 of Table 1 in Schedule 3;

• “Group B parameter” means a parameter specified in column 2 of Table 2 or, as the case may be, Table 3 in Schedule 3;

• “indicative dose” means the committed effective dose for 1 year of ingestion resulting from all the radionuclides whose presence has been detected in a supply of water intended for human consumption, of natural and artificial origin, excluding tritium, potassium-40, radon and short-lived radon decay products;

• “indicator parameter” means a parameter listed in Schedule 2;

• “monitoring of a group A parameter” has the meaning given in regulation 5(1);

• “monitoring of a group B parameter” has the meaning given in regulation 5(3);

• “NTU” means Nephelometric Turbidity Unit;

• “parameter” means a property, element, organism or substance listed in the second column of Table A or Table B in Schedule 1 to these Regulations, or in Schedule 2, as read, where appropriate, with the notes to Schedule 2 and those Tables;

• “pesticides and related products” means any of the following, and includes their relevant metabolites, degradation and reaction products—any organic insecticide;any organic herbicide;any organic fungicide;any organic nematocide;any organic acaricide;any organic algicide;any organic rodenticide;any organic slimicide; andany product related to any of (a) to (h) (including any growth regulator);

• “parametric value” and “prescribed concentration or value”, in relation to any parameter, means the maximum or minimum concentration or value specified in relation to that parameter in Table A or Table B in Schedule 1 as measured by reference to the unit of measurement so specified and as read, where appropriate, with the notes to those Tables;

• “Public Health England” means the executive agency of that name of the Department of Health and Social Care;

• “Public Health Wales National Health Service Trust” means a National Health Service Trust within the meaning of the National Health Service (Wales) Act 2006 if, and in so far as, it has the function of providing services in relation to public health in Wales ;

• “radioactive parameters” means the following indicator parameters listed in Schedule 2—indicative dose (item 8);radon (item 9);tritium (item 12);

• “regulation 4(1) purposes”, in relation to the supply of water, means a supply—for such domestic purposes as consist in or include, cooking, drinking, food preparation or washing; orfor any of those domestic purposes, to premises in which food is produced ;

• “relevant supplier” means a water undertaker or water supply licensee;

• “retail licensee” means a person who is the holder of a water supply licence with a restricted retail authorisation within the meaning of Schedule 2A to the Act ;

• “sampling point”—in relation to water supplied from a distribution network, means a point, being a consumer's tap, that is selected for the purposes of Part 4 of these Regulations;in relation to water supplied from a tanker, means the point at which the water emerges from the tanker;

• “specification”, in relation to an indicator parameter, means the concentration, value or state, shown as applicable to that parameter in Schedule 2 as measured by reference to the unit of measurement so shown;

• “state”, in relation to an indicator parameter, means the state specified in relation to that parameter in Schedule 2 as measured by reference to the unit of measurement so specified;

• “suitably accredited body” means the Welsh Ministers or a person acting on behalf of the Welsh Ministers;

• “supplementary licensee” means a person who is the holder of a water supply licence with a supplementary authorisation within the meaning of Schedule 2A to the Act;

• “supply point” means a blending point, service reservoir, treatment works or other point, not being a sampling point, which the Welsh Ministers authorise under regulation 8 for the purposes of regulation 6;

• “supply system” is to be construed in accordance with section 17B(5) of the Act (section 17A: supplementary) ;

• “water of a relevant description” means water supplied by a relevant supplier which uses a supply system for the purposes of supplying water to consumers, being a supply system into which the water undertaker or supplementary licensee introduces water;

• “water supply zone”, in relation to a water undertaker and a year, means an area designated for that year by the water undertaker in accordance with regulation 3; and

• “year” means a calendar year.

• (2) In these Regulations a reference to an application or notice includes a reference to that application or notice in electronic form.

• (3) In these Regulations, a “monitoring programme” is the identification and collection of data on any substance or organism identified during a risk assessment to confirm compliance with the prescribed concentrations set out in Schedule 1, and—

• (a) must consist of—

• (i) collection and analysis of discrete water samples;

• (ii) measurements recorded by a continuous monitoring process; or

• (iii) a combination of both of the methods described in paragraph (i) and (ii) at the frequency required in Schedule 3 or at a frequency notified to the water undertaker or supplementary licensee; and

• (b) may also consist of—

• (i) inspections of records of the functionality and maintenance of status of equipment; and

• (ii) inspections of the catchment area, water abstraction, treatment, storage and distribution infrastructure.

• (4) Subject to paragraph (4), references in these Regulations to a service reservoir are references to any structure in which a reserve of water that has been treated with a view to complying with the requirements of regulation 4 is contained and stored for the sole purpose of meeting a variable demand for the supply of water.

• (5) Where references in these Regulations to a service reservoir would, but for this paragraph, include references to a structure comprising more than one compartment—

• (a) each compartment which has its own water inlet and water outlet and is not connected hydraulically to any other compartment will be treated as a single service reservoir;

• (b) the compartments that are connected hydraulically will be treated as a single service reservoir; and

• (c) unless all of the compartments are connected hydraulically, the structure as a whole will not be treated as a service reservoir.

• (6) In these Regulations, a reference to an EU or Euratom Directive is to be read as if any reference in that Directive to a member State in a provision imposing an obligation on, or providing a discretion to, a member State were to either the Welsh Ministers or local authority depending on which, immediately before exit day, was responsible for compliance with that obligation, or exercise of that discretion, in respect of England or Wales.

PART 2 — Water Supply Zones

Water supply zones

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• (1) Before the beginning of each year in which it intends to supply water, a water undertaker must designate the names and areas within its area of supply that are to be its water supply zones for that year.

• (2) A water supply zone may not comprise an area whose population immediately before the beginning of the year in question is estimated by the water undertaker to exceed 100,000.

• (3) The water quality within a water supply zone must be approximately uniform.

• (4) A water undertaker may not vary a designation under paragraph (1) after the beginning of the year in relation to which the designation has effect.

PART 3 — Wholesomeness

Wholesomeness

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• (1) Subject to paragraphs (4) and (5), water supplied to premises that is intended for human consumption including—

• (a) for such domestic purposes as consist in or include, cooking, drinking, food preparation or washing, or

• (b) for food production purposes,

is to be regarded as wholesome for the purposes of Chapter III, as it applies to the supply of water for those purposes, if the requirements of paragraph (2) are satisfied.

• (2) The requirements of this paragraph are—

• (a) that the water does not contain—

• (i) any micro-organism (other than a parameter listed in Schedule 1) or parasite, or

• (ii) any substance (other than a parameter listed in Schedule 1),

at a concentration or value which would constitute a potential danger to human health;

• (b) that the water does not contain any substance (whether or not a parameter) at a concentration or value which, in conjunction with any other substance it contains (whether or not a parameter) would constitute a potential danger to human health;

• (c) that the water does not contain concentrations or values of the parameters listed in Tables A and B in Schedule 1 in excess of or, as the case may be, less than, the prescribed concentrations or values; and

• (d) that the water satisfies the formula “[nitrate]/50 + [nitrite]/3 < 1”, where the square brackets signify the concentrations in mg/l for nitrate (NO₃) and nitrite (NO₂).

• (3) The point at which the requirements of paragraph (2), in so far as they relate to the parameters set out in Part 1 of Table A and in Table B in Schedule 1 are to be complied with is—

• (a) in the case of water supplied from a tanker, the point at which the water emerges from the tanker;

• (b) in the case of water supplied in bottles or containers, the point at which the water first emerges from any bottle or container collected from a local distribution point;

• (c) in the case of water used in a food production undertaking, the point at which it is used in the undertaking; and

• (d) in any other case, the consumer's tap.

• (4) Water supplied for regulation 4(1) purposes will not be regarded as wholesome for the purposes of Chapter III if, on transfer from a treatment works for supply for those purposes—

• (a) it contains a concentration of the coliform bacteria or E coliparameter (items 1 and 2 in Part 2 of Table A in Schedule 1) in excess of the prescribed concentrations; or

• (b) it contains a concentration of nitrite in excess of 0.1 mg NO₂/l.

• (5) Subject to paragraph (6), water supplied for regulation 4(1) purposes will not be regarded as wholesome for the purposes of Chapter III if, on transfer from a service reservoir for supply for those purposes, it contains a concentration of the coliform bacteria or E coliparameter in excess of the prescribed concentrations.

• (6) Water transferred from a service reservoir for supply for regulation 4(1) purposes is to be regarded as unwholesome if more than 5% of samples taken in a year exceed the prescribed concentration for the coliform bacteria parameter.

PART 4 — Monitoring of Water Supplies

Interpretation and application of Part 4

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• (1) In this Part “monitoring of a Group A parameter” means monitoring of a Group A parameter for the purpose of obtaining information at regular intervals—

• (a) as to the organoleptic and microbiological quality of water;

• (b) where relevant, as to the effectiveness of drinking water treatment, particularly for the purposes of disinfection, for the purposes referred to in paragraph (2); and

• (c) as regards indicator parameters, whether water supplied for regulation 4(1) purposes meets the specifications for those parameters.

• (2) The purpose of monitoring of a Group A parameter is to determine whether the presence of such a parameter in water supplied for regulation 4(1) purposes satisfies the provisions of Part 3 or, if a departure has been authorised under Part 7 in relation to that supply, the provisions of Part 3 as read with the terms of that departure.

• (3) In this Part, “monitoring of a Group B parameter” means monitoring of a Group B parameter for the purpose of obtaining information from which it may be established whether water supplied for regulation 4(1) purposes—

• (a) satisfies the provisions of Part 3 or, if a departure has been authorised under Part 7 in relation to that supply, the provisions of Part 3 as read with the terms of that departure;

• (b) meets the specifications for indicator parameters; and

• (c) in respect of other parameters identified as relevant by the Welsh Ministers under regulation 9, meets the specifications for those parameters.

• (4) This Part applies to water supplied for regulation 4(1) purposes by a relevant supplier in the performance of its duties under Chapter III.

• (5) Regulations 6 to 10 apply to a supplementary licensee in relation to samples taken from supply points as they apply to a water undertaker, but only in so far as the supplementary licensee is introducing water into a water supply zone in which the water undertaker takes samples under this Part (to the extent authorised by or under regulation 8) from supply points.

Monitoring: general provisions

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• (1) Paragraph (2) applies for the purpose of determining whether water to which this Part applies satisfies the provisions of Part 3 or, if a departure has been authorised under Part 7 in relation to that supply, those provisions as read with the terms of that authorisation.

• (2) A water undertaker must take or cause to be taken, and analyse or cause to be analysed, not less than the number of samples of the water within each of the water supply zones which it supplies specified in, or in accordance with the provisions of, this Part and Schedule 3.

• (3) Except in a case to which paragraph (4) applies, the parameters listed in Tables A and B in Schedule 1 and the indicator parameters must be subject to—

• (a) monitoring of a Group A parameter if the parameter is one listed in column 2 of Table 1 in Schedule 3, and the circumstances specified in column 3 of that Table apply; and

• (b) monitoring of a Group B parameter in any other case.

• (4) Where the distribution of water in any part of a water supply zone is by tanker and is (or is likely to be) an intermittent short-term supply, samples of water from each tanker from which the water is distributed must be taken—

• (a) at the commencement of the distribution from that tanker; and

• (b) every 48 hours thereafter until the distribution is discontinued.

• (5) Of the samples taken in accordance with paragraph (3) in relation to each distribution—

• (a) the first sample must be analysed for compliance with the following parameters—

• (i) E. coli (item 2 in Part 2 of Table A in Schedule 1); and

• (ii) conductivity (item 6 in Schedule 2); and

• (b) the second and any subsequent samples must be analysed for compliance with those and every other parameter.

• (6) For the purposes of the application of paragraph (3)(b) to the aluminium, iron and manganese parameters (items 1, 9 and 10 in Table 1 in Schedule 3, a supply which consists of both groundwater and surface water will be deemed to be a supply which consists only of surface water.

• (7) Compliance samples for chemical parameters, including copper, lead and nickel must take the form of a random daytime sample of one litre volume taken at a consumer's tap without prior flushing.

• (8) A water undertaker must monitor each water supply zone within its area of supply for the radioactive parameters contained in Schedule 2 in accordance with paragraphs (9) to (16).

• (9) As regards the indicative dose parameter—

• (a) monitoring must be carried out where an artificial source of radionuclides or elevated natural radioactivity is present and it cannot be shown on the basis of other representative monitoring programmes or other investigations that the level of indicative dose is below the value specified in Schedule 2;

• (b) where monitoring for natural radionuclide levels is required, the Welsh Ministers must define the frequency of the monitoring of either gross alpha activity, gross beta activity or individual natural radionuclides, depending on the screening strategy adopted in accordance with Schedule 4;

• (c) where the monitoring frequency defined in accordance with sub-paragraph (b) requires one sample per year for naturally occurring radioactivity, a further sample must be taken where any change occurs in relation to the supply that is likely to influence the concentrations of radionuclides in water supplied for regulation 4(1) purposes;

• (d) in the case of naturally occurring radionuclides where the results of the monitoring referred to in sub-paragraph (b) show that the concentration of radionuclides in the supply is stable, the minimum sampling and analysis frequencies are to be decided by the Welsh Ministers and confirmed by notice to the water undertaker, taking into account the risk to human health;

• (e) a water undertaker may use a screening strategy for gross alpha, gross beta activity or individual radionuclides and, in the event that there is any exceedance of the value specified in Schedule 2, it must carry out an analysis of the specific radionuclides in accordance with Schedule 4.

• (10) As regards the radon parameter—

• (a) a water undertaker must ensure that a representative survey is carried out in accordance with paragraph (11) to determine the likelihood of a supply failing the parametric value for radon specified in Schedule 2; and

• (b) monitoring must be carried out where there is reason to believe, on the basis of the results of the representative surveys or other reliable information, that the parametric value for radon might be exceeded.

• (11) A representative survey must be designed in such a way—

• (a) as to be capable of determining the scale and nature of likely exposures to radon in water intended for human consumption originating from different types of groundwater sources and wells in different geological areas; and

• (b) that the underlying parameters, in particular the geology and hydrology of the area, radioactivity of rock or soil, and well type, can be identified and used to direct further action to areas of likely high exposure.

• (12) As regards the tritium parameter—

• (a) monitoring must be carried out where an anthropogenic source of tritium or other artificial radionuclides is present within the catchment area and it cannot be shown on the basis of other surveillance programmes or investigations that the level of tritium is below the parametric value specified in Schedule 2; and

• (b) if the concentration of tritium exceeds its parametric value, an investigation of the presence of other artificial radionuclides must be carried out.

• (13) Where a parametric value is exceeded in a particular sample, the Welsh Ministers must define the extent of re-sampling necessary to ensure that the measured values are representative of an average activity concentration for a full year.

• (14) The Welsh Ministers may notify a water undertaker which supplies water to a water supply zone that a radioactive parameter need not be monitored if the Welsh Ministers are satisfied that, for the period specified in the notice, the water supplied to that zone for regulation 4(1) purposes—

• (a) gives rise to a calculated indicative dose that is below the parametric value specified in Schedule 2;

• (b) contains levels of radon that are below the parametric value specified in Schedule 2;

• (c) contains levels of tritium that are below the parametric value specified in Schedule 2.

• (15) Where paragraph (14) applies, the Welsh Ministers must publish, in such manner as the Welsh Ministers consider appropriate, the grounds for the notification with the necessary documentation supporting the decision (including the findings of any surveys, monitoring or investigations carried out).

• (16) The Welsh Ministers must by notice in writing withdraw a notice under paragraph (14)—

• (a) given in relation to the indicative dose parameter, if the Welsh Ministers believe that water supplied to the zone in question for regulation 4(1) purposes gives rise to a calculated indicative dose that is likely to exceed the parametric value specified in Schedule 2;

• (b) given in relation to the radon parameter, if the Welsh Ministers believe that water supplied to the zone in question for regulation 4(1) purposes contains levels of radon that are likely to exceed the parametric value specified in Schedule 2;

• (c) given in relation to the tritium parameter, if the Welsh Ministers believe that water supplied to the zone in question for regulation 4(1) purposes contains levels of tritium that are likely to exceed the parametric value specified in Schedule 2.

• (17) A water undertaker which receives a notice under paragraph (16) must monitor or cause to be monitored the indicative dose parameter or, as the case may be, the radon or tritium parameter, in accordance with Tables 8 to 13 (as applicable) in Schedule 3.

Sampling points

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Except in relation to water supplied from a tanker, sampling points in respect of every parameter, other than a parameter for which samples are taken from a supply point authorised by or under regulation 8, must be selected at random unless, by notice in writing to a water undertaker (whether or not on the application of the water undertaker), the Welsh Ministers otherwise determine.

Authorisation of supply points

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• (1) For those parameters specified as item 6 in column 1 of Table 1, and items 1 to 12 and 14 to 21 in column 1 of Table 3, in Schedule 3, samples may be taken from —

• (a) any blending point;

• (b) the water leaving any service reservoir which receives water from a treatment works before its supply to any consumer; and

• (c) the water leaving any treatment works.

• (2) If the Welsh Ministers are satisfied that analysis of those samples will produce data which are unlikely to differ in any material respect from the data that would be produced from analysis within the sampling points, the Welsh Ministers may authorise the use for the purposes of regulation 6 of those samples taken for a water supply zone from a blending point, a service reservoir of that description or a treatment works.

• (3) In respect of any water supply zone, the taking of samples from a supply point is not authorised by paragraph (2) where a supplementary licensee introduces water into the water supply zone unless the water quality within the water supply zone remains approximately uniform.

• (4) Subject to paragraph (6), the Welsh Ministers may, in relation to any parameter not covered by an authorisation under paragraph (2), on the written application of a water undertaker or on the joint written application of a water undertaker and supplementary licensee, authorise the use for the purposes of regulation 6 of samples taken for a water supply zone otherwise than from a sampling point.

• (5) An authorisation under paragraph (4) may extend to all samples in relation to that parameter or to such number or proportion of those samples as is specified in the authorisation.

• (6) The Welsh Ministers must not grant an authorisation under paragraph (4) unless they are satisfied that analysis of samples taken from a point other than a sampling point will produce data in respect of the parameter in question which are unlikely to differ in any material respect from the data that would be produced in respect of that parameter from analysis of samples obtained from sampling points.

• (7) Subject to paragraph (8), the Welsh Ministers may at any time modify or revoke an authorisation under paragraph (4).

• (8) Unless it appears to the Welsh Ministers that the immediate modification or revocation of an authorisation under paragraph (4) is required in the interests of public health, they must not modify or revoke such an authorisation without giving to the water undertaker to which the authorisation relates at least 6 weeks' notice of their intention to modify or revoke.

• (9) A water undertaker must notify the Welsh Ministers as soon as it has reasonable grounds for believing that an analysis of samples taken for a water supply zone from a point other than a sampling point would produce data in respect of the parameter in question which would differ in a material respect from the data produced by an analysis of samples taken from any of the sampling points within that zone.

• (10) On being notified under paragraph (9) and without the need for prior notice to the water undertaker, the Welsh Ministers must revoke the authorisation.

Number of samples

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• (1) In each year a water undertaker must take or cause to be taken from its sampling points, or to the extent authorised under regulation 8, from its supply points, the standard number of samples for analysis of residual disinfectant and each parameter listed in—

• (a) column (2) of Table 1 in Schedule 3 (Group A parameters);

• (b) column (2) of Table 2 in Schedule 3 (Group B1 parameters);

• (c) column (2) of Table 3 in Schedule 3 (Group B2 parameters);

• (d) column (2) of Table 4 in Schedule 3 (Group A1 parameters);

• (e) column (2) of Table 5 in Schedule 3 (Group A2 parameters);

• (f) column (2) of Table 6 in Schedule 3 (Group A3 parameters); and

• (g) column (2) of Table 7 in Schedule 3 (Group A4 parameters).

• (2) In respect of any parameter not referred to in paragraph (1), the Welsh Ministers may specify—

• (a) the number of samples which a water undertaker must take or cause to be taken from its sampling points in each year; and

• (b) its prescribed concentration or value.

• (3) Samples required to be taken by this regulation must—

• (a) be taken at regular intervals;

• (b) in respect of sampling for chemical parameters in the distribution network other than sampling at a consumer's tap, be taken, and handled in accordance with ISO 5667-5 entitled “Water quality. Sampling. Guidance on treatment of drinking water from treatment works and piped distribution systems.”; and

• (c) in respect of microbiological parameters in the distribution network and at a consumer's tap, be taken and handled in accordance with European Standard EN ISO 19458, entitled “Water Quality – Sampling for microbiological analysis”, using sampling purpose A in the distribution network and sampling purpose B at a consumer's tap.

• (4) Subject to paragraph (5) the Welsh Ministers may, in respect of any supplies of water by a water undertaker to a water supply zone, treatment works, supply point or a service reservoir, give the water undertaker written notice of any variation of—

• (a) the parameters subject to sampling (by the omission or addition of parameters); and

• (b) the number of samples which the undertaker must take in the period specified in the notice.

• (5) Paragraph (4) does not apply in relation to E.coli.

• (6) The Welsh Ministers may give a notice under paragraph (4)—

• (a) on the Welsh Ministers' own motion; or

• (b) where paragraph (8) applies, upon application by a water undertaker.

• (7) A notice under paragraph (4)—

• (a) must specifiy which parameters are subject to variation;

• (b) must specify the extent of any variation from the standard number of samples required to be taken under paragraph (1) or from the number of samples required to be taken under paragraph (2);

• (c) may require a risk assessment to be undertaken;

• (d) may be revoked or varied by the Welsh Ministers.

• (8) This paragraph applies where—

• (a) a risk assessment complying with this regulation has been undertaken;

• (b) the results of the risk assessment described in sub-paragraph (a) are considered, and that risk assessment indicates that no factor can be reasonably anticipated to be likely to cause deterioration of the quality of the water;

• (c) in the case where the water undertaker seeks to cease monitoring a particular parameter, the results from samples taken in respect of the parameter collected at regular intervals over a period of at least 3 years are all at less than 30% of the parametric value of the parameter; and

• (d) in the case where the water undertaker seeks to reduce the frequency of monitoring in respect of a particular parameter, the results from samples taken in respect of that parameter collected at regular intervals over a period of at least 3 years are all at less than 60% of the parametric value of the parameter.

• (9) The Welsh Ministers must by further written notice withdraw a notice under paragraph (4) if the Welsh Ministers believe that any parameter in the water supply to which the notice relates contravenes the prescribed concentration or value or is likely to do so.

• (10) A water undertaker given notice under paragraph (4) must institute a monitoring programme which must be kept under annual review.

• (11) A risk assessment complies with this regulation where—

• (a) it meets the principles of European standard EN 15975-2 entitled “Security of drinking water supply - Guidelines for risk and crisis management - Part 2: Risk management” or of other equivalent standards accepted at international level;

• (b) it is subject to a system of quality control which is checked from time to time by a suitably accredited body; and

• (c) it takes into account the results of monitoring conducted under the second paragraph of Article 7(1) and Article 8 of Directive 2000/60/EC of the European Parliament and of the Council establishing a framework for Community action in the field of water policy .

• (12) In this regulation “the standard number” means the number of samples specified in Part 2 or Part 3 of Schedule 3 in respect of a parameter specified in Part 1 of that Schedule.

• (13) For the purposes of paragraph (11)(c), a reference to Articles 7(1) and 8 of Directive 2000/60/EC is to be read with the following modifications—

• (a) as if any reference to Annex 5 of that Directive were a reference to that Annex as modified by Part 1 of Schedule 5 to the Water Environment (Water Framework Directive) (England and Wales) Regulations 2017;

• (b) in Article 8, as if—

• (i) in paragraph 1, the final indent were omitted;

• (ii) in paragraph 2, the first sentence were omitted;

• (iii) paragraph 3 were omitted.

Sampling: further provisions

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• (1) Paragraph (2) applies as soon as a relevant supplier has reasonable grounds for believing that any element, organism or substance, other than a residual disinfectant or a parameter (whether alone or in combination with any parameter or any other element, organism or substance) may cause the supply within any of the water supply zones which it supplies to be a supply which does not satisfy—

• (a) the provisions of Part 3; or

• (b) if a departure has been authorised under Part 7, those provisions as read with the terms of that authorisation.

• (2) Where this paragraph applies, the relevant supplier must take or cause to be taken sufficient samples from water within that zone (whether from a service reservoir, a treatment works or otherwise) in respect of any element, organism or substances, in order to establish whether that water is wholesome.

PART 5 — Monitoring – Additional Provisions

Sampling for particular substances and parameters

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• (1) For the purposes of establishing the quality of water to be supplied to any of its water supply zones, a water undertaker must take, or cause to be taken, and analyse, or cause to be analysed, not less than the number of samples specified in this Part.

• (2) For the purposes of establishing the quality of water to be supplied in any supply system into which a supplementary licensee introduces water, a supplementary licensee must take, or cause to be taken, and analyse, or cause to be analysed, not less than the number of samples specified in this Part.

Sampling at treatment works

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• (1) Subject to paragraph (3), in each year every water undertaker or supplementary licensee must take, or cause to be taken, from the point at which water leaves each treatment works which it uses to supply water to water supply zones, the standard number of samples for analysis—

• (a) for determining the concentration of residual disinfectant;

• (b) for determining whether, in relation to the colony counts and turbidity parameters, water leaving treatment works meets the specifications for those parameters set out in Schedule 2; and

• (c) for testing for compliance with the prescribed concentrations or values in respect of the coliform bacteria, E coli, and nitrite parameters for water leaving treatment works.

• (2) Samples required to be taken by this regulation must be taken at regular intervals.

• (3) Where a particular treatment works is in use for part only of a year, the minimum number of samples to be taken from that works in that year must bear to the standard number or, as the case may be, the number specified in a current notice given by the Welsh Ministers under regulation 9 which departs from the standard number, the same proportion as the number of days in that year in which the treatment works have been in use bears to 365.

• (4) In this regulation, “the standard number” has the same meaning as in regulation 9.

Sampling at service reservoirs

13

• (1) Every water undertaker or supplementary licensee must take, or cause to be taken, from each of its service reservoirs in each week in which the reservoir is in use or as directed by notification by the Welsh Ministers under regulation 9(4), one sample for analysis—

• (a) for testing for compliance with the prescribed concentrations or values in respect of the parameters E coliand coliform bacteria;

• (b) for determining the concentration of residual disinfectant; and

• (c) for determining whether the specification in relation to the colony counts parameter is met.

Sampling: new sources

14

• (1) This regulation applies in relation to—

• (a) any source which has not previously been used for the supply of water by a water undertaker or supplementary licensee; and

• (b) any source which has been so used but not so used for a period of 6 months preceding the date on which the water undertaker or supplementary licensee proposes to supply water from it.

• (2) Every water undertaker or supplementary licensee must take, or cause to be taken, in accordance with paragraph (3) and (4), such samples of that water as will enable it to establish —

• (a) whether water can be supplied from that source without contravening section 68(1) of the Act (duties of water undertakers and licensed water suppliers with respect to water quality) ; and

• (b) the treatment necessary to ensure that section 68(1) of the Act is complied with in relation to the supply of that water.

• (3) The samples must be taken or caused to be taken—

• (a) before the water undertaker or supplementary licensee supplies water from a source mentioned in paragraph (1)(a);

• (b) as soon as is reasonably practicable after the water undertaker or supplementary licensee has begun to supply water from a source mentioned in paragraph (1)(b).

• (4) Samples must be taken—

• (a) in the case of a source mentioned in paragraph (1)(a), in respect of—

• (i) the parameters listed in Schedules 1 and 2; and

• (ii) any other element, organism or substance which, in the opinion of the water undertaker or supplementary licensee proposing to use the source, may cause the supply to contravene section 68(1) of the Act;

• (b) in the case of a source mentioned in paragraph (1)(b), in respect of—

• (i) the parameters listed in Table A in Schedule 1;

• (ii) the conductivity, hydrogen ion and turbidity parameters; and

• (iii) any other parameter as regards which the water undertaker or supplementary licensee proposing to use the source is of the opinion that its concentration or value is likely to have altered since the last occasion on which water from that source was analysed.

• (5) Unless the conditions in paragraph (6) are satisfied, a water undertaker or supplementary licensee must not supply water from a source mentioned in paragraph (1)(a) for regulation 4(1) purposes until 1 month has passed following the day on which the water undertaker or supplementary licensee complied with regulation 28(1) with respect to that source.

• (6) The conditions are that the water undertaker or supplementary licensee—

• (a) must supply water from the source as a matter of urgency in order to prevent an unexpected interruption in piped supply to consumers; and

• (b) before the supply is made, has carried out a risk assessment under regulation 27 specifically with respect to the source.

• (7) For the purposes of paragraph (6)(b), regulation 27 will apply to supplies made as a matter of urgency as if “treatment works” includes a source from which untreated water is supplied.

Collection and analysis of samples

15

• (1) Every water undertaker or supplementary licensee must secure, so far as reasonably practicable, that when it takes, handles, transports, stores or analyses any sample required to be taken for the purposes of Part 4 or this Part, or causes any such sample to be taken, handled, transported, stored or analysed, it complies with the appropriate requirements.

• (2) In this regulation, “the appropriate requirements” means such of the following requirements as are applicable—

• (a) the sample is representative of the quality of the water at the time of sampling;

• (b) the person taking a sample is subject to a system of quality control to an appropriate standard;

• (c) the sample is not contaminated when being taken;

• (d) the sample is kept at such a temperature and in such conditions as secure that there is no material alteration of the concentration or value for the measurement or observation of which the sample is intended;

• (e) the sample is analysed, whether at the time and place it is taken or as soon as reasonably practicable after it has been taken—

• (i) by or under the supervision of a person who is competent to perform that task; and

• (ii) with the use of such equipment as is suitable for the purpose;

• (f) the collection and transportation of samples, or measurements recorded by continuous monitoring shall be subject to a system of quality control to an appropriate standard checked from time to time by a suitably accredited body.

• (3) Every water undertaker or wholesale licensee must secure that a suitably accredited body from time to time checks its compliance with the appropriate requirements.

• (4) Additionally, any person involved in seeking to discharge the obligation described in paragraph (1) must ensure that—

• (a) the methods of analysis used by that person for the purposes of monitoring and demonstrating compliance with this Part are validated and documented in accordance with European standard EN ISO/IEC 17025 entitled “General requirements for the competence of testing and calibration laboratories” or other equivalent standards accepted at international level; and

• (b) that person applies quality management system practices in accordance with European standard EN ISO/IEC 17025 or other equivalent standards accepted at international level.

• (5) Every water undertaker or supplementary licensee must maintain such records as are sufficient to enable it to establish, in relation to each sample taken for the purposes of Part 4 or this Part, that such of the appropriate requirements as are applicable to that sample have been satisfied.

• (6) Subject to paragraph (7), for the purpose of establishing, within acceptable limits of deviation and detection, whether the sample contains concentrations or values which contravene the prescribed concentrations or values, or exceed the specifications for indicator parameters—

• (a) the method of analysis specified in column 2 of Table A1 in Schedule 5 must be used for the parameter specified in relation to that method in column 1;

• (b) the method of analysis in respect of the parameters listed in column 1 of Table A3 in Schedule 5 must be capable of measuring concentrations equal to the parametric value with a limit of quantification of 30% or less and an uncertainty of measurement as specified in column 2 of that Table and the result must be expressed—

• (i) using at least the same number of significant figures as the parametric value; and

• (ii) in the same units laid down in these Regulations; and

• (c) the method of analysis used for the odour and taste parameters (items 5 and 7 in Part 2 of Table B in Schedule 1) must be capable, at the time of use, of measuring values equal to the parametric value with a precision or uncertainty of measurement of 1 dilution number at 25°C.

• (7) The Welsh Ministers may, on the application of any person, authorise a method of analysis other than that specified in paragraph (6)(a) (“the prescribed method”).

• (8) An application for the purposes of paragraph (7) must be made in writing and must be accompanied by—

• (a) a description of the method of analysis; and

• (b) the results of the tests carried out to demonstrate the reliability of that method and its equivalence to the prescribed method.

• (9) The Welsh Ministers must not authorise the use of the method proposed in an application under paragraph (7) unless they are satisfied that the results obtained by the use of that method are at least as reliable as those produced by the use of the prescribed method.

• (10) An authorisation under paragraph (7) may be subject to such conditions as the Welsh Ministers consider appropriate.

• (11) The Welsh Ministers may at any time, by notice in writing served on the water undertaker or supplementary licensee to which an authorisation under paragraph (7) has been given, revoke the authorisation, but any such notice must be served no later than 3 months before the date on which the revocation is stated to take effect.

Collection and analysis of samples: transitional provision

16

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PART 6 — Drinking Water Protected Areas

Drinking water abstraction points: monitoring sites

17

• (1) Every water undertaker or supplementary licensee must identify every point from which it abstracts water for supply for regulation 4(1) purposes.

• (2) At every abstraction point, the relevant water undertaker or supplementary licensee must take, or cause to be taken, such samples, and analyse, or cause to be analysed, those samples for such properties, organisms and substances as it considers necessary in order to comply with regulations 26 to 28.

• (3) In relation to any abstraction point, the Welsh Ministers may, by notice served on the relevant water undertaker or supplementary licensee, require the relevant water undertaker or supplementary licensee—

• (a) to take, or cause to be taken, such numbers of samples of water per year as may be specified; and

• (b) to analyse, or cause to be analysed, those samples for such concentrations or values of such properties, organisms and substances, and at such frequencies, as may be specified.

• (4) The Welsh Ministers may, by notice served on the relevant water undertaker or supplementary licensee, revoke or amend a notice served under paragraph (3).

• (5) Every analysis required under—

• (a) paragraph (2), in relation to every body of surface water which provides more than 100 cubic metres of water per day as an average, must be carried out at no less than the following frequencies—

• (i) 4 per year, where the population served by the body of surface water is less than 10,000 people;

• (ii) 8 per year, where the population so served is 10,000 to 30,000 people; and

• (iii) 12 per year, where the population so served is greater than 30,000 people; and

• (b) paragraphs (2) and (3) must be in accordance with such relevant standards as may be specified by the Welsh Ministers by notice served on the water undertaker or supplementary licensee.

• (6) For the purposes of—

• (a) paragraphs (2) and (3)—

“abstraction point” means an abstraction point identified under paragraph (1); and

“relevant water undertaker or supplementary licensee” means the water undertaker or supplementary licensee which identified the abstraction point;

• (b) paragraph (3), “specified” means specified in the notice served under that paragraph; and

• (c) paragraph (5), “body of surface water” has the meaning given in Directive 2000/60/EC of the European Parliament and of the Council establishing a framework for Community action in the field of water policy.

PART 7 — Investigations, Authorisation of Departures and Remedial Action

Investigations: Schedule 1 parameters

18

• (1) A water undertaker or supplementary licensee must immediately take such steps as are necessary to identify the matters specified in paragraph (2) where it has reason to believe that water of a relevant description—

• (a) fails, or is likely to fail, to satisfy a requirement of regulation 4(2);

• (b) is to be regarded as unwholesome by virtue of regulation 4(4); or

• (c) if regulation 4(6) were ignored, would be regarded as unwholesome by virtue of regulation 4(5).

• (2) The matters referred to in paragraph (1) are—

• (a) the cause and extent of the failure or, as the case may be, the apprehended failure;

• (b) the Schedule 1 parameters in respect of which the prescribed concentration or value has not been, or is unlikely to be, achieved; and

• (c) in relation to each parameter so identified, whether the failure, or apprehended failure, to achieve the prescribed concentration or value is attributable—

• (i) to the domestic distribution system;

• (ii) to the maintenance of that system; or

• (iii) to neither of those matters.

• (3) Where a departure has been authorised under this Part—

• (a) paragraph (1) will apply only in respect of the Schedule 1 parameters (if any) that are not specified in the authorisation; and

• (b) every water undertaker or supplementary licensee which has reason to believe that water of a relevant description fails, or is likely to fail, to satisfy the concentration or value required by the authorisation in relation to any Schedule 1 parameter, must immediately take such steps as are necessary to identify the matters specified in paragraph (4).

• (4) The matters referred to in paragraph (3) are—

• (a) the cause and extent of the failure or, as the case may be, the apprehended failure;

• (b) the Schedule 1 parameters in respect of which the required concentration or value has not been, or is unlikely to be, achieved; and

• (c) in relation to each parameter so identified, whether the failure, or apprehended failure, to achieve that concentration or value is attributable—

• (i) to the domestic distribution system;

• (ii) to the maintenance of that system; or

• (iii) to neither of those matters.

• (5) As soon as possible after the matters specified in paragraph (2) or (4), as the case may be, have been identified, the water undertaker or supplementary licensee must—

• (a) notify the Welsh Ministers—

• (i) of those matters;

• (ii) whether it is its opinion that, in relation to each parameter identified in accordance with paragraph (2)(b) or (4)(b), a failure in respect of that parameter is likely to recur;

• (iii) of the action (if any) taken by it in relation to a failure which is attributable to the domestic distribution system or the maintenance of that system; and

• (b) send a copy of that notice to any other relevant supplier which uses the supply system for the purposes of supplying water to consumers who are likely to be affected by the failure.

• (6) Where the water undertaker or supplementary licensee has identified a failure attributable to the domestic distribution system or to the maintenance of such a system, it must, at the same time as notification is given under paragraph (5)—

• (a) by notice in writing—

• (i) to those of its consumers who are likely to be affected by the failure; and

• (ii) to any other relevant supplier which uses the supply system for the purposes of supplying water to consumers who are likely to be affected by the failure, inform them of the nature of the failure and provide details of the steps (if any) that, in its opinion, it is necessary or desirable for those consumers to take in the interests of their health; and

• (b) send a copy of that notice to the Welsh Ministers and to each appropriate local authority.

• (7) A relevant supplier which receives a notice under paragraph (6)(a)(ii) must immediately send or cause to be sent a copy of that notice to those of its consumers who are likely to be affected by the failure.

• (8) A water undertaker or supplementary licensee which has complied with the requirements of paragraphs (5) and (6) need not, in respect of the same failure or apprehended failure, comply with the requirements of regulation 35(6)(a)(iv).

• (9) Where such a failure as is mentioned in paragraph (1) relates to the copper or lead parameter, the relevant supplier must, as soon as reasonably practicable after the occurrence, modify or replace such of its pipes and their associated fittings as it knows or has reason to believe have the potential for contributing to copper or lead in the water supplied to the premises, so as to eliminate that potential (whether or not the presence of copper or lead in those pipes contributed to the failure).

Investigations: indicator parameters

19

• (1) Where a water undertaker or supplementary licensee has reason to believe that water of a relevant description does not meet the specifications for indicator parameters set out in Schedule 2, it must immediately take such steps as are necessary to identify—

• (a) whether water of a relevant description does or does not meet the specifications;

• (b) the indicator parameters in respect of which the specifications are not met;

• (c) if the specification for the coliform bacteria or colony counts parameter (items 4 and 5 in Schedule 2) is not met, whether the inability to meet that specification is attributable—

• (i) to the domestic distribution system;

• (ii) to the maintenance of that system; or

• (iii) to neither of those matters;

• (d) if the specification for the tritium parameter is not met, whether the inability to meet the specification is attributable to artificial radionuclides.

• (2) As soon as possible after the matters specified in paragraph (1) have been identified, the water undertaker or supplementary licensee must—

• (a) notify the Welsh Ministers—

• (i) of those matters;

• (ii) whether it is its opinion that, in relation to each parameter identified in accordance with paragraph (1)(b), a recurrence of the inability to meet the specification in respect of that parameter is likely; and

• (b) send a copy of that notice to any other relevant supplier which uses the supply system for the purposes of supplying water to consumers who are likely to be affected by the failure.

• (3) Where, in a case to which paragraph (1)(c) applies, the inability to meet the specification has been identified as attributable to the domestic distribution system or to the maintenance of that system, the water undertaker or supplementary licensee must, at the same time as notification is given under paragraph (2)—

• (a) by notice in writing—

• (i) to those of its consumers who are likely to be affected by the failure; and

• (ii) to any other relevant supplier which uses the supply system for the purposes of supplying water to consumers who are likely to be affected by the failure, inform them of the nature of the failure and provide details of the steps (if any) that, in its opinion, it is necessary or desirable for those consumers to take in the interests of their health; and

• (b) send a copy of that notice to the Welsh Ministers and to each appropriate local authority.

• (4) A relevant supplier which receives a notice under paragraph (3)(a)(ii) must immediately send or cause to be sent a copy of that notice to those of its consumers who are likely to be affected by the failure.

Action by the Welsh Ministers

20

• (1) Where—

• (a) a notification given in accordance with paragraph (6) of regulation 18 in the circumstances mentioned in paragraph (1) of that regulation (including that paragraph as read with paragraph (4)(a) of that regulation) discloses—

• (i) a failure in respect of a parameter specified in Table B in Schedule 1, and

• (ii) that the failure is not attributable to the domestic distribution system or the maintenance of that system, and

• (b) it appears to the Welsh Ministers that the failure is not trivial and is likely to recur,

the Welsh Ministers may, by notice in writing to any relevant supplier which uses the supply system for the purposes of supplying water to consumers in respect of which the notification was given, require that relevant supplier to seek a departure in accordance with regulation 22.

• (2) The exercise by the Welsh Ministers of the power conferred by paragraph (1) will not preclude the exercise by the Welsh Ministers of the power conferred by section 18 of the Act (orders for securing compliance with certain provisions) .

• (3) Where—

• (a) a notification given in accordance with regulation 18(5) in the circumstances mentioned in regulation 18(3)(b) discloses—

• (i) a failure in relation to any parameter specified in Table B in Schedule 1, and

• (ii) that the failure is not attributable to the domestic distribution system or the maintenance of that system, and

• (b) it appears to the Welsh Ministers that the failure in respect of that parameter is not trivial and is likely to recur,

the Welsh Ministers must consider whether to vary the terms of an authorisation under regulation 22.

• (4) Where—

• (a) a notification given in accordance with regulation 19(2) discloses an inability to meet the specification applicable to an indicator parameter, and

• (b) the Welsh Ministers consider that the inability poses a potential danger to human health,

the Welsh Ministers must, by notice in writing to any relevant supplier which uses the supply system for the purposes of supplying water to consumers in respect of which the notification was given, require that relevant supplier to take such steps as may be determined by the Welsh Ministers and specified in the notice.

• (5) A relevant supplier to whom a notice under paragraph (4) has been given must take the steps specified in the notice

Failure attributable to domestic distribution system where water is supplied to the public

21

• (1) Paragraph (3) applies where the Welsh Ministers consider that the failure (or, in the case of regulation 18, apprehended failure) disclosed by a notification under regulation 18(5) or regulation 19(2)—

• (a) is attributable to the domestic distribution system, or the maintenance of that system, in premises where water supplied for regulation 4(1) purposes is made available for use by the members of the public, including schools within the meaning of the Education Act 1996 , hospitals and restaurants;

• (b) is not trivial and is likely to recur; and

• (c) in the case of a notification given under regulation 19(2), poses a potential danger to human health.

• (2) References in this regulation to “failure” are references to a failure or apprehended failure of the type referred to in paragraph (1).

• (3) Subject to paragraph (7), the Welsh Ministers must as soon as possible, serve a notice in writing on—

• (a) the water undertaker that supplies water to the premises, or

• (b) the water undertaker whose supply system is used for the purpose of a water supply licensee making a supply of water to the premises,

requiring it to exercise the power conferred by section 75(2) of the Act (power to prevent damage and to take steps to prevent contamination, waste etc.) in respect of the failure.

• (4) The provisions of section 75(2) to (12) of the Act apply in relation to the exercise of the power in section 75(2) in pursuance of a notice served under paragraph (3), subject to the modifications in paragraph (5).

• (5) Those modifications are—

• (a) subsections (2)(b) and (4) are to be read as if any reference to “damage, contamination, waste, misuse or undue consumption” were a reference to the failure.

• (b) subsection (9) is to be read as if for the words from “the water undertaker shall have power” to the end of paragraph (b) there were substituted—

“the water undertaker— (a) must take those steps itself; and (b) subject to subsection (10) may recover any expenses reasonably incurred by the undertaker in taking those steps from the person on whom the notice was served.

• (6) Where the water undertaker exercises the power in section 75(2) of the Act pursuant to a notice served by the Welsh Ministers under paragraph (3) it must inform by notice in writing any of its other consumers who are likely to be affected, of the steps it has taken, and that notice must include a copy of any notice that it has served.

• (7) Where the Welsh Ministers consider that the failure (or any aspect of it) is attributable to factors arising from the further distribution by a person other than a water undertaker or water supply licensee of water supplied by a water undertaker or water supply licensee, the Welsh Ministers—

• (a) must not serve a notice under paragraph (3) in respect of that failure or aspect of it; and

• (b) if the Welsh Ministers consider that the local authority needs information or assistance from the water undertaker or water supply licensee in order to be able to carry out its duties under regulation 17 (provision of information) or 18 (investigation) of the Private Water Supplies (Wales) Regulations 2017 , the Welsh Ministers must serve a notice on the water undertaker or water supply licensee requiring it to provide such information or assistance to the local authority as is specified in the notice.

• (8) The water undertaker or water supply licensee on which a notice under this regulation has been served must take the steps specified in the notice as soon as possible.

Authorisation of temporary supply of water that is not wholesome

22

• (1) Subject to paragraph (2), the Welsh Ministers may, upon the written application of a relevant supplier, authorise in accordance with regulation 23 a departure from the provisions of Part 3 of these Regulations in so far as they relate to—

• (a) a parameter specified in Table B in Schedule 1; and

• (b) the supply of water by a relevant supplier in any of the water supply zones which it uses for the purposes of supplying water to consumers.

• (2) The Welsh Ministers must not authorise a departure under paragraph (1) unless they are satisfied—

• (a) that the authorisation is necessary to maintain in that zone a supply of water for regulation 4(1) purposes;

• (b) that a supply of water for those purposes cannot be maintained in that zone by any other reasonable means; and

• (c) that the supply of water in accordance with the authorisation does not constitute a potential danger to human health.

• (3) Every water undertaker or supplementary licensee must provide with its application—

• (a) a statement—

• (i) of the grounds on which the authorisation is sought;

• (ii) of the water supply zone in respect of which the authorisation is sought;

• (iii) of the parameters in respect of which the prescribed concentration or value cannot be met;

• (iv) in respect of each parameter to which paragraph (iii) applies, of the results of the analysis of the samples taken in the water supply zone in question during the 12 months immediately preceding the first day on which the prescribed concentration or value could not be met;

• (v) in respect of each parameter to which paragraph (iii) applies, of the results of the analysis of the samples (if any) taken in the water supply zone in question between the first day on which the prescribed concentration or value could not be met and the date of the application;

• (vi) of the average daily quantity of water supplied to that zone or, if that quantity cannot readily be ascertained, of the average daily quantity of water supplied from the treatment works that supplies water to that zone;

• (vii) of the estimated population of that zone;

• (viii) as to whether, if a departure were authorised in the terms sought, any relevant food-production undertaking would be affected;

• (ix) of the period for which the authorisation is sought; and

• (x) of the reasons why the supply cannot be maintained by other reasonable means;

• (b) a scheme for monitoring the quality of water supplied in the zone during the period for which the authorisation is sought; and

• (c) a summary of the steps that it proposes to take, either alone or together with other relevant suppliers, in order to secure that the supply fully satisfies the requirements of Part 3, including—

• (i) a timetable for the work;

• (ii) an estimate of the cost of the work; and

• (iii) provisions for reviewing the progress of the work and for reporting the result of the review to the Welsh Ministers.

• (4) At the same time as it makes an application for an authorisation under paragraph (1), the water undertaker or supplementary licensee must serve a copy of the application and of the statement, scheme and summary referred to in paragraph (3)on—

• (a) every appropriate local authority;

• (b) the Public Health Wales National Health Service Trust;

• (c) where the water supply zone is wholly or partly in England, Public Health England; and

• (d) the Council .

• (5) A body on whom documents have been served in accordance with paragraph (4) may make representations to the Welsh Ministers in connection with the application; and any such representations must be made not later than the end of the period of 30 days beginning with the date on which the application for the authorisation is made.

Authorisations: terms and conditions

23

• (1) Subject to paragraph (2), a departure may be authorised under regulation 22 for such period as is in the Welsh Ministers' opinion reasonably required for securing a supply of water for regulation 4(1) purposes that fully satisfies the requirements of Part 3 (“the departure period”).

• (2) No departure period may exceed 3 years.

• (3) Subject to paragraph (4), an authorisation under regulation 22—

• (a) must specify—

• (i) the grounds on which it is granted;

• (ii) every water supply zone in respect of which it is granted;

• (iii) the extent to which a departure from the prescribed concentration or value of any parameter is authorised;

• (iv) in respect of each parameter to which paragraph (iii) applies, the results of the analysis of the samples taken in each water supply zone in question during the 12 months immediately preceding the first day on which the prescribed concentration or value could not be met;

• (v) in respect of each parameter to which paragraph (iii) applies, the results of the analysis of the samples (if any) taken in each water supply zone in question between the first day on which the prescribed concentration or value could not be met and the date of the application;

• (vi) the average daily quantity of water supplied from each of those zones or, if that quantity cannot readily be ascertained, the average daily quantity of water supplied from the treatment works that supplies water to that zone;

• (vii) the estimated population of each of those zones;

• (viii) whether or not any relevant food-production undertaking would be affected; and

• (ix) the departure period;

• (b) must require the implementation of a scheme for monitoring the quality of water supplied in each of those zones during the departure period (which may be, but need not be, the scheme submitted in accordance with regulation 22(3)(b));

• (c) must require the carrying out of the steps which, in its opinion, are reasonably required in order to secure that the supply fully satisfies the requirements of Part 3 (whether or not the steps are those proposed in the summary submitted in accordance with regulation 22(3)(c));

• (d) must specify, in relation to those steps—

• (i) the timetable for the work;

• (ii) an estimate of the cost of the work; and

• (iii) provisions for reviewing the progress of the work and for reporting to it the result of the review; and

• (e) must require a relevant supplier to provide to the relevant population advice as to the measures (if any) that it would be advisable for them to take in the interests of their health for the whole or any part of the departure period.

• (4) In paragraph (3)(e), “relevant population” means the population within the water supply zones to which the authorisation applies and, in particular, those groups of that population for which the supply of water in accordance with the authorisation could present a special risk.

• (5) Where paragraph (6) applies, the particulars to be specified in the authorisation are those required by paragraph (3)(a)(iii) and (ix), and paragraph (3)(b) to (e) does not apply.

• (6) This paragraph applies where the Welsh Ministers are of the opinion that—

• (a) the extent of the contravention of the requirements of Part 3 as respects any parameter is trivial; and

• (b) the prescribed concentration or value as respects that parameter is likely to be achieved within the period of 30 days beginning with the day on which the prescribed concentration or value in respect of that parameter was contravened.

• (7) Where it appears to the Welsh Ministers that a supply of water that fully satisfies the requirements of Part 3 cannot be restored by the end of the departure period, they may authorise a further two departures.

• (8) Paragraphs (1) to (6) will apply to a further departure authorised under paragraph (7) as they apply to a departure authorised under regulation 22.

• (9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

• (10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

• (11) An authorisation under regulation 22 or this regulation may be limited to water supplied—

• (a) from particular sources or classes of source;

• (b) to particular water supply zones or to zones of particular descriptions.

Publicity for authorisations

24

• (1) As soon as reasonably practicable after a departure has been authorised under regulation 22 or 23, the specified relevant suppliers must—

• (a) separately publish, by making accessible, free of charge, on their websites via a hyperlink maintained on their respective homepages for at least 14 days—

• (i) except in a case to which paragraph (4) of regulation 23 applies, a notice containing a statement of the matters specified in paragraph (3)(a)(ii), (iii), (viii) and (ix) of that regulation; and

• (ii) in a case to which paragraph (4) of regulation 23 applies, a notice containing a statement of the matters specified in paragraph (3)(a)(ii), (iii) and (ix) of that regulation; and

• (b) jointly give such other public notice of the authorisation and of its terms and conditions as the Welsh Ministers may, by notice served on the specified relevant suppliers, reasonably require.